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Just like the Sun, only 10 times bigger?!?
They say this star, V1449 Aql, which is 10 times bigger than the Sun,
but due to it oscillations is similar to the Sun. Anybody know what oscillations of the Sun they are talking about that made it unique until they discovered this star's oscillations? Yousuf Khan Scientists stumble upon sun-like massive star "Scientists have reportedly discovered a massive star 10 times the mass of the sun, but with similar oscillations, which could help studies on the interiors of celestial bodies, besides understanding the reasons behind the fluctuations inside the sun." http://www.deccanherald.com/content/...e-massive.html |
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Just like the Sun, only 10 times bigger?!?
On Mon, 22 Jun 2009 19:35:07 -0400, Yousuf Khan
wrote: They say this star, V1449 Aql, which is 10 times bigger than the Sun, but due to it oscillations is similar to the Sun. Anybody know what oscillations of the Sun they are talking about that made it unique until they discovered this star's oscillations? Yousuf Khan Scientists stumble upon sun-like massive star "Scientists have reportedly discovered a massive star 10 times the mass of the sun, but with similar oscillations, which could help studies on the interiors of celestial bodies, besides understanding the reasons behind the fluctuations inside the sun." http://www.deccanherald.com/content/...e-massive.html Perhaps this is in reference to those 110,000 year solar output cycles that are the cause of the glacial/interglacial cycles on Earth. Gordon |
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Just like the Sun, only 10 times bigger?!?
On Jun 23, 11:35*am, Yousuf Khan wrote:
They say this star, V1449 Aql, which is 10 times bigger than the Sun, but due to it oscillations is similar to the Sun. Anybody know what oscillations of the Sun they are talking about that made it unique until they discovered this star's oscillations? * * * * Yousuf Khan Scientists stumble upon sun-like massive star "Scientists have reportedly discovered a massive star 10 times the mass of the sun, but with similar oscillations, which could help studies on the interiors of celestial bodies, besides understanding the reasons behind the fluctuations inside the sun."http://www.deccanherald.com/content/9494/scientists-stumble-sun-like-... They mean the wobble that the gravitational effect of the planets have on our sun. the sun is not stationary in position - besides any rotation I mean. Hardy |
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Just like the Sun, only 10 times bigger?!?
"Yousuf Khan" wrote in message
... They say this star, V1449 Aql, which is 10 times bigger than the Sun, but due to it oscillations is similar to the Sun. Anybody know what oscillations of the Sun they are talking about that made it unique until they discovered this star's oscillations? Yousuf Khan Scientists stumble upon sun-like massive star "Scientists have reportedly discovered a massive star 10 times the mass of the sun, but with similar oscillations, which could help studies on the interiors of celestial bodies, besides understanding the reasons behind the fluctuations inside the sun." http://www.deccanherald.com/content/...e-massive.html This is a beta Cephei star, an early B-type that varies with small amplitude oscillations. It is not a solar type star. The "sun-like" aspect is that the oscillations seen in higher (radial and ?non radial? modes) resemble the frequency pattern seen in the Sun. The Sun's interior structure can be probed using such oscillations so the hope is that the interior structure of V1449 Aql can also be explored by the same methods. Otherwise this star is a very different sort of beast. These methods were used to show, for example, that the solar core actually has the amount of helium depletion that corresponds to stellar-evolutionary calculations for a 1-solar-mass star of age 4.56 billion years. So maybe something similar can be done for this beta Cephei star. "Stumble" is not quite right. The star was on the CoRoT list of stars to be intensively studied, so they already thought it might provide some interesting results. It was no accident. -- Mike Dworetsky (Remove pants sp*mbl*ck to reply) |
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Just like the Sun, only 10 times bigger?!?
On Jun 22, 6:39 pm, Sam Wormley wrote:
The team’s lab tests indicate that the ratio of boron-11 and boron-12 isotopes incorporated from seawater into the calcium carbonate shells of a marine microorganism called Globigerinoides sacculifer depends on the pH of the water in which the creatures lived. That pH, in turn, depends on the concentration of carbon dioxide in the air, because the gas forms an acid when it dissolves in water. So, the scientists propose that chemical analyses of G. sacculifer shells in ancient sediments should give an indirect measure of the atmosphere’s past carbon dioxide levels. I'm pretty sure boron-12 does not occur in nature. And this proxy seems dubious as over long times one would think the CO2 changes would be mostly neutralised by the dissolution of rock. Andrew Usher |
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Just like the Sun, only 10 times bigger?!?
On Jun 23, 8:41*am, "Mike Dworetsky"
wrote: This is a beta Cephei star, an early B-type that varies with small amplitude oscillations. *It is not a solar type star. The "sun-like" aspect is that the oscillations seen in higher (radial and ?non radial? modes) resemble the frequency pattern seen in the Sun. *The Sun's interior structure can be probed using such oscillations so the hope is that the interior structure of V1449 Aql can also be explored by the same methods. *Otherwise this star is a very different sort of beast. These methods were used to show, for example, that the solar core actually has the amount of helium depletion that corresponds to stellar-evolutionary calculations for a 1-solar-mass star of age 4.56 billion years. *So maybe something similar can be done for this beta Cephei star. "Stumble" is not quite right. *The star was on the CoRoT list of stars to be intensively studied, so they already thought it might provide some interesting results. It was no accident. So, does this mean that they are able to see the whole stellar disk of this star on some telescopes, rather than just being a point of light? How else would they be able to see vibrations and oscillations on the star? |
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Just like the Sun, only 10 times bigger?!?
YKhan wrote:
On Jun 23, 8:41 am, "Mike Dworetsky" wrote: This is a beta Cephei star, an early B-type that varies with small amplitude oscillations. It is not a solar type star. The "sun-like" aspect is that the oscillations seen in higher (radial and ?non radial? modes) resemble the frequency pattern seen in the Sun. The Sun's interior structure can be probed using such oscillations so the hope is that the interior structure of V1449 Aql can also be explored by the same methods. Otherwise this star is a very different sort of beast. These methods were used to show, for example, that the solar core actually has the amount of helium depletion that corresponds to stellar-evolutionary calculations for a 1-solar-mass star of age 4.56 billion years. So maybe something similar can be done for this beta Cephei star. "Stumble" is not quite right. The star was on the CoRoT list of stars to be intensively studied, so they already thought it might provide some interesting results. It was no accident. So, does this mean that they are able to see the whole stellar disk of this star on some telescopes, rather than just being a point of light? How else would they be able to see vibrations and oscillations on the star? The usual way - spectroscopy and doppler shifts. Have you thought of buying yourself a good undergraduate textbook so you can find out some of the basic techniques used in scientific astronomy? |
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Just like the Sun, only 10 times bigger?!?
OG wrote:
YKhan wrote: So, does this mean that they are able to see the whole stellar disk of this star on some telescopes, rather than just being a point of light? How else would they be able to see vibrations and oscillations on the star? The usual way - spectroscopy and doppler shifts. Have you thought of buying yourself a good undergraduate textbook so you can find out some of the basic techniques used in scientific astronomy? How do you see vibrations through spectroscopy and doppler shifts? Yousuf Khan |
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Just like the Sun, only 10 times bigger?!?
"OG" wrote in message
... YKhan wrote: On Jun 23, 8:41 am, "Mike Dworetsky" wrote: This is a beta Cephei star, an early B-type that varies with small amplitude oscillations. It is not a solar type star. The "sun-like" aspect is that the oscillations seen in higher (radial and ?non radial? modes) resemble the frequency pattern seen in the Sun. The Sun's interior structure can be probed using such oscillations so the hope is that the interior structure of V1449 Aql can also be explored by the same methods. Otherwise this star is a very different sort of beast. These methods were used to show, for example, that the solar core actually has the amount of helium depletion that corresponds to stellar-evolutionary calculations for a 1-solar-mass star of age 4.56 billion years. So maybe something similar can be done for this beta Cephei star. "Stumble" is not quite right. The star was on the CoRoT list of stars to be intensively studied, so they already thought it might provide some interesting results. It was no accident. So, does this mean that they are able to see the whole stellar disk of this star on some telescopes, rather than just being a point of light? How else would they be able to see vibrations and oscillations on the star? The usual way - spectroscopy and doppler shifts. Have you thought of buying yourself a good undergraduate textbook so you can find out some of the basic techniques used in scientific astronomy? CoRoT is a precision photometry instrument--it doesn't use spectroscopy AFAIK. The solar oscillations are, however, observed through high-precision doppler spectroscopy, because extremely accurate photometry of the sun is difficult. All stars other than the sun are observed as points of light (with exceptions for interferometric studies). The frequencies emerge from the Fourier Transform of the light variations. -- Mike Dworetsky (Remove pants sp*mbl*ck to reply) |
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Just like the Sun, only 10 times bigger?!?
"Mike Dworetsky" wrote in message o.uk... "OG" wrote in message ... The "sun-like" aspect is that the oscillations seen in higher (radial and ?non radial? modes) resemble the frequency pattern seen in the Sun. to be intensively studied, so they already thought it might provide some interesting results. It was no accident. So, does this mean that they are able to see the whole stellar disk of this star on some telescopes, rather than just being a point of light? How else would they be able to see vibrations and oscillations on the star? The usual way - spectroscopy and doppler shifts. Have you thought of buying yourself a good undergraduate textbook so you can find out some of the basic techniques used in scientific astronomy? CoRoT is a precision photometry instrument--it doesn't use spectroscopy AFAIK. Very true, thanks for the correction. The solar oscillations are, however, observed through high-precision doppler spectroscopy, because extremely accurate photometry of the sun is difficult. So only half wrong then :-) All stars other than the sun are observed as points of light (with exceptions for interferometric studies). The frequencies emerge from the Fourier Transform of the light variations. |
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